package plugins

import (
	"os"
	"path/filepath"
	"testing"

	core "agent-system-core"
	"agent-system-backend/internal/settings"
	"agent-system-backend/internal/store"
	"agent-system-backend/internal/tools"
)

func newHost(t *testing.T) (*Host, *tools.Registry, string) {
	t.Helper()
	dir := t.TempDir()
	st, err := store.OpenSQLite(filepath.Join(dir, "test.db"))
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { st.Close() })
	reg := tools.NewRegistry()
	reg.RegisterBuiltin()
	setSvc := settings.NewService(st)
	pluginDir := filepath.Join(dir, "plugins")
	os.MkdirAll(pluginDir, 0o755)
	return New(st, reg, setSvc, pluginDir), reg, pluginDir
}

// writeExamplePlugin 写一个覆盖五类能力的最小示例插件目录。
func writeExamplePlugin(t *testing.T, dir, id string) {
	t.Helper()
	root := filepath.Join(dir, id)
	for _, sub := range []string{"tools", "panels", "cards", "intents", "prompts"} {
		os.MkdirAll(filepath.Join(root, sub), 0o755)
	}
 writeFile := func(rel, content string) {
		if err := os.WriteFile(filepath.Join(root, rel), []byte(content), 0o644); err != nil {
			t.Fatal(err)
		}
	}
	writeFile("plugin.json", `{"id":"`+id+`","name":"示例插件","version":"0.1.0","apiVersion":"`+core.PluginAPIVersion+`",
		"requires":{"network":["api.example.com"]},
		"provides":{"tools":["http_echo"],"intents":["demo"],"panels":["demo"],"cards":["note"],"prompts":["assistant"],"settings":["greeting"]}}`)
	writeFile("tools/http_echo.json", `{"name":"http_echo","description":"回显输入到示例端点","source":"plugin",
		"parameters":{"type":"object","properties":{"text":{"type":"string"}},"required":["text"]},
		"http":{"method":"POST","url":"https://api.example.com/echo","bodyTemplate":"{\"q\":\"{{param.text}}\"}","resultPath":"echo"}}`)
	writeFile("panels/demo.json", `{"id":"demo","title":"示例面板","body":[{"type":"markdown","markdown":"# 示例\n插件面板。"}]}`)
	writeFile("cards/note.json", `{"kind":"note","data":[{"type":"markdown","markdown":"插件卡片模板"}]}`)
	writeFile("intents/demo.json", `[{"id":"demo.show","domain":"demo","includes_any":["示例"]}]`)
	writeFile("prompts/assistant.md", `你是示例插件附带的助手模板。`)
	writeFile("settings.json", `[{"key":"greeting","group":"plugin:`+id+`","label":"问候语","type":"string","default":"你好","effect":"hot"}]`)
}

func TestLoadAndRegister(t *testing.T) {
	host, reg, dir := newHost(t)
	writeExamplePlugin(t, dir, "example")

	results := host.LoadDir()
	if err := results["example"]; err != nil {
		t.Fatalf("load: %v", err)
	}
	// 工具注册（source=plugin，声明式 HTTP 绑定执行器）。
	desc, exec, ok := reg.Get("http_echo")
	if !ok || desc.Source != core.SourcePlugin || desc.PluginID != "example" || exec == nil {
		t.Fatalf("tool not registered: %+v", desc)
	}
	// 面板/卡片/意图/提示词/设置声明。
	lds := host.List()
	if len(lds) != 1 || len(lds[0].Panels) != 1 || lds[0].Cards["note"] == nil || len(lds[0].Intents) != 1 || lds[0].Prompts["assistant"] == "" {
		t.Fatalf("loaded state wrong: %+v", lds)
	}
	if len(host.SettingsSchema()) != 1 || host.SettingsSchema()[0].Group != "plugin:example" {
		t.Errorf("plugin settings schema: %+v", host.SettingsSchema())
	}
}

func TestUnloadRemovesRegistrations(t *testing.T) {
	host, reg, dir := newHost(t)
	writeExamplePlugin(t, dir, "example")
	host.LoadDir()
	if _, _, ok := reg.Get("http_echo"); !ok {
		t.Fatal("prerequisite: tool registered")
	}
	// 目录中删除插件后重载 → 卸载语义。
	os.RemoveAll(filepath.Join(dir, "example"))
	host.LoadDir()
	if _, _, ok := reg.Get("http_echo"); ok {
		t.Error("tool should be unregistered after plugin removal")
	}
	if len(host.List()) != 0 {
		t.Error("plugin should be unloaded")
	}
	// 内置工具不受影响（核心零回归）。
	if _, _, ok := reg.Get("knowledge_search"); !ok {
		t.Error("builtin tool must survive plugin unload")
	}
}

// fail-closed：坏资产整批拒绝，不部分注册。
func TestFailClosedOnBadAsset(t *testing.T) {
	host, reg, dir := newHost(t)
	writeExamplePlugin(t, dir, "example")
	// 破坏工具资产（非法 JSON）。
	os.WriteFile(filepath.Join(dir, "example", "tools", "http_echo.json"), []byte(`{broken`), 0o644)

	results := host.LoadDir()
	if err := results["example"]; err == nil {
		t.Fatal("bad asset should fail load")
	}
	if _, _, ok := reg.Get("http_echo"); ok {
		t.Error("fail-closed violated: tool registered from broken plugin")
	}
	if len(host.List()) != 0 {
		t.Error("broken plugin must not be in loaded list")
	}
}

func TestAPIVersionGuard(t *testing.T) {
	host, _, dir := newHost(t)
	writeExamplePlugin(t, dir, "oldapi")
	os.WriteFile(filepath.Join(dir, "oldapi", "plugin.json"), []byte(`{"id":"oldapi","name":"旧版","version":"1.0.0","apiVersion":"0.9","provides":{}}`), 0o644)
	results := host.LoadDir()
	if err := results["oldapi"]; err == nil {
		t.Fatal("incompatible apiVersion should be rejected")
	}
}